42 gw, Wiring diagram legend electrical connections, Connections – Carrier 42GW User Manual

Page 13: Warning

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42 GW

GB - 12

IMPORTANT for units with electric heaters;
The unit is equipped with two thermostats: one with automatic
reset and one with manual (electric) reset that can be
reactivated by switching the power supply off and then on.

Connect the power cables to terminal box connectors in
accordance with the wiring diagram and tighten firmly.

IMPORTANT:
• Make ground connection prior to any other electrical

connections.

• If the unit is fitted with an electric heater, this must have a

separate power supply.
Ensure that the mains supply connection is made through a
switch that disconnects all poles, with a contact gap of at least 3
mm.

• Fix the power cable of the electric resistance heaters under the

single cable clamp. Make certain that the YELLOW/GREEN
cable is stripped back further than the others.

The control panel can be reached by opening the grille and
removing the metal covers using the 3 or 4 screws.

Wiring diagram legend

Electrical connections

Low speed

Medium speed

High speed

Power supply line

Heating selection

Common thermostat (heating)

Cooling selection

Common thermostat (cooling)

Neutral fan

Neutral in

Neutral out

Neutral

Heating out

Cooling out

Factory wiring

Field wiring

Connector

Terminal on terminals

Normally closed contact

Normally open contact

Capacitor

FC

Fan capacitor

FS

Safety switch float

IFM

Fan motor indoor unit

PR

Drain pump relay

PS

Drain pump

C1-3

Connectors

HR

Heating relay

CR

Cooling relay

CEV

Electric valve (cooling)

HEV

Electric valve (heating)

PCB

Relay board

HTR

Electric heater

ST

Safety thermostat

T

Timer

TB

Terminal board

Connections

L

Line phase

N

Neutral

Warning:

Any warranty is declined in case of

field changes of factory wiring and

settings

Note

The connection sequence does not

represent the physical lay-out.

Cables colour

A

Brown

B

Blue

C

Black

G

Grey

R

Red

W

White

Y-G

Yellow/Green

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